Gold-concentrator.



A. II.` MACKIE.

GOLD CONCENTRATOR. APPLICATION FILED IuLYI9, I9I1.

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A. R. MACKIE.

GOLD CONCENTRATOR.

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ALFRED R. MACKIE, OF LANDER, WYOMING.

GOLD-CONCENTRATOR.

Specification of Letters Patent.

Patented Nov. 26, 1918.

Application filed July 19, 1917. Serial No. 181,502.

To all whom it may concern:

13e it known that I, ALFRED R. MACKIE, a c1t1zen of the United States, and a resident of Lander, in the county of Fremont and State of Wyoming, have invented a new and Improved Gold-Concentrator, of which the tfollowing is a full, clear, and exact descriplon.

My invention relates to concentrators for gold, and an object thereof is to provide a simple and efficient concentrator which will diminish manual labor to a minimum.

Another object of the invention is to pro vide a concentrator of the gravitational type in which movable rakes are provided for moving the material to be concentrated over grades and thereby facilitate and expedite the process of concentration.

With the above and other objects in view, the nature of which will more fully appear as the description proceeds, the invention consists in the novel construction, combination and arrangement of parts as herein fully described, illustrated and claimed.

In the accompanying drawings, forming part of the application, similar characters of reference indicate corresponding parts in al1 the views.

Figure 1 is a longitudinal section through aconcentrator embodying mv invention;

Fig. 2 is a side elevation of the mechanism for raising and reciprocating the rakes in the boxes;

Fig. 3 is a fragmentary plan elevation of the structure shown in Fig. 2, certain parts in said plan view being broken out to show the details of construction.

Referring to the drawings, 10 is a drum having perforations therein disposed above a box 28, which box slopes toward its delivery end, which is disposed above a box 30, also disposed to slope to the delivery end; in consequence, the tendency of the charge within the boxes is to travel toward the delivery end. The box 30 has a screen 31 spaced from the bottom and on to which screen the material from the box 28 falls. This screen also slopes toward the open or discharge end of the box 30 to facilitate the movementof the material on the screen toward the discharge end. Between the bottom of the box 30 and the screen 31 ritlles 32 are accommodated. They are supported by a frame 33 within the box. The frame also retains on the bottom of the box a screen 35 and a mat 36, the screen resting on the mat and the mat resting` on the bottom of the box.

The box 30 accommodates a rake 37 above the screen 31. The rake comprises a number of transverse bars 38 extending substantially across the entire width of the box. The transverse bars are interconnected by longitudinal bars 39 and thereby a unitary structure is formed. Trunnions 40 are provided on a pair of transverse bars. These trunnions bear on the side edges of the box and project beyond to enter slots 41 in the longer arms of bell-crank levers 42. The bell-crank levers are pivotally connected to the sides of the box near the junction of the two arms. The shorter arms of the bell-crank levers are interconnected by a link 43.

The box 30 discharges into a similar box 30 sloping similarly and having a screen 3l therein of a mesh smaller than the mesh of the screen 31 in the box 30. The box 30 has also riies 32', the frame 33 of which rests on a screen 35', which screen anchors the mat 36 to the bottom of the sluice box 3,0. The rake 37 above the screen 31 is mounted on bell-crank levers 42 in a manner similar as previously described. The short arms of said bell-crank levers 42 are connected b v a link 44 which extends to engage pivotallv the link 43 ofthe bell-crank levers 42 on the box 30. The number of boxes may be varied according to the degree of classification desired. As shown, there are three sluice boxes. that is to say, the material from the box 30 is delivered to a box 30 from which it discharges into a tail race 45. The box 30 is identical with the boxes 30 and 30 except that the fabric 31 thereof is of a finer mesh than the fabric 31 of the box 30. The bell-crank levers 42" have the short arms thereof connected by a rod 46, a portion of which extends to join the rod 44 of the box 30. It therefore will be noted that all of the bell-crank levers of the dif ferent rakes are interconnected and motion imparted to any of said bell-crank levers will be transmitted to the others by the rods connecting said levers.

`Each of the rods 46 carries a roller 47 which bears against a cam 48 constrained to .all of the rakes in the boxes therewith towardthe discharge en d of the boxes. The length of the slots in the bell-crank levers is substantially equal to 'the throw of the crank Shaft.' When the rakes have reached the limit of their movement toward the difehaige end of 'the boxes the cam 48 begins to move the rods 46 and therewith the rods 4 3y and 44. p This movement of the rods causes the bellfcrank levers to swing on their pivots, thereby raising kthe longer arms in ,l which thel slots are formed.V The retiiin movement 0f' thecraiik vl),e'gins to i'iiove the rakestoward the inlet end of the boxes, and in view of the rising ofthe bell-crank levers the rakes are movednp from the screens. As' the limitof the return movement of the rakesis 'reached the cams 48 leave the rollers 4f?, that is, the longer arms of the bell-crank levers are broughtdown and the raleS are restored .to their initial position on their respective screens.y Thus it will be seen that during the return movement of the rakes they are clear from the Screen, so as ynot to move the material upon the screen toward theinlet end.

Thematerial remaining on the met screen,

Y. that is, onv screen 31" is raked oli on to a conveyepA56.k running transversely Of the tail race 4,5 into which the 'material from the last mat vS d.scli'argedA The inclination 0f the boxes and screens.

therein iS Such that gravity and the How of Waterare unable to disturb or carry oli3 the if'aluableuinaterial present, but are able to feed and Wash off the non-valuable mate- Ahave elongated slots through 'which the trunnions project, means pivotally connecting said bell-crank levers to the sides of the box, means for moving the shorter arms of the bell-crank levers vperiodically whereby the longer arms are moved, and means .for sliding said rake in the slots of the longer arms` of the bell-crank levers.

2. In a g'oldconcentrator, a plurality of boxes each open at one end and each disposed to slope toward the open end'theieof, the preceding box being Iadapted to discharge into the succeeding one, a grading screen in each of the boxes above the bottom thereof' sloping similarly to the bottom, a rake hav-` ing trunnions and disposed in each box above the grading screen` bell-crankv levers pivotally secured to 'the sides of eachbox, the longer arms of said bell-crank Ilevers. having elongatedslots through which thel trunnions of the rake project, means pivotf ally connecting the Ishorter arms of each-box tothe shorter arms of the other box, a 'cant for actuating one of, said eonne'ctng' means whereby said arms are oscillated, means for connectingr pivotally the rakes of the adja` cent boxes, a crank shaft, a connectingrod connecting the crank shaft to the proximate rake, 'and means gearing Said @am and crank shaft so thatvall of said rakes are caused to' move rearwardly when said bellecrank le.

vers are Oscillatedt t,

3. ii a gold Concentrates, a .Series ef screens disposed in steppedl relation', a rake over each screen, -slotted guides for each rake,

means for raising said slotted guides whenv the rakes are retracted, and means foreimultaneously reciprocating vsaid ralkes.`

ALFRED n. Macina.

Genies ci' l"this'paiaii'c' may be obtained for five cents each, by addressingthe Commissioner of Patente,

Washington, D. C." 

